PHP PDF密码保护（无密码无法打开）

Question

I got a php / javascript based web application that sends created PDF files via E-Mail. This PDF files should be password protected from opening so that no one can open this files without the password. tcpdf & fpdf are not the right ways (because everyone could open the PDF but not modify or not copy or not print)

anyone got an idea?

Answer 1

FPDF (+FPDF_Protection) and also TCPDF will work. You will have to pass BOTH user AND owner password to the setProtection() method. If you leave one as an empty string the viewer application is able to authenticate with this "empty string-password" automatically.